基线校准法测量变形及其在粘土砖高温耐压强度测定中的应用  

Deformation measured with baseline calibration method and its application in determination of compressive strength of fireclay bricks at elevated temperature

作　　者：朱青友[1] 程旭[1] 余超[1] 祝洪喜[1] 尹玉成[1] 邓承继[1] ZHU Qingyou;CHENG Xu;YU Chao;ZHU Hongxi;YIN Yucheng;DENG Chengji(The State Key Laboratory of Refractory and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China)

机构地区：[1]武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北武汉430081

出　　处：《钢铁研究学报》2024年第10期1308-1317,共10页Journal of Iron and Steel Research

基　　金：国家自然科学基金资助项目(U21A2057);湖北省重点研发计划资助项目(2023BAB106)。

摘　　要：温度和应力之间的耦合作用会导致耐火材料产生过大变形,从而危及炉衬结构的稳定性。因此,精确测量变形对于窑炉寿命的设计和预测至关重要。荷重软化温度和蠕变率是评估耐火材料在低应力水平下高温压缩变形的主要方法。然而,将这些方法直接应用于高应力水平工况可能导致顶杆弯曲、断裂和垫片变形等问题。为解决这一难题,提出了基于压力机软件的位移记录功能的基线校准法,用于测试耐火材料在高温下的压缩变形,并详细阐述了该方法的原理和合理性。根据粘土砖和荷重软化温度,测量其不同温度下高温耐压强度,对比其测量偏差,最小为3.2%。利用CT技术检测试验后样品内部孔隙分布,其闭气孔率从3.43%增加至8.10%,并结合物相和典型形貌分析,进一步表明基线校准法具有较高的准确性和实用性。根据试验结果提出了高温耐压强度的判断依据和定义,为耐火材料的研究以及高温窑炉炉衬的设计提供了理论支持。The coupling effect between temperature and stress can cause excessive deformation of refractory materials,thereby endangering the stability of the furnace lining structure.Therefore,accurate measurement of deformation is essential for designing and predicting furnace lifespan.The load softening temperature and creep rate are the main methods for evaluating the high-temperature compression deformation of refractories at low stress levels.However,applying these methods directly to high stress levels may lead to issues such as bent pins,broken pins,and gasket deformation.To address this challenge,a baseline calibration method based on the displacement recording function of the pressure machine for evaluating high-temperature compression deformation of refractories was proposed,and the principle and rationality of this method were elaborated in detail.According to the softening temperature of fireclay bricks,the high-temperature compressive strength was measured at different temperatures,and the measurement deviation was compared.The minimum deviation was 3.2%.By using CT technology to detect the internal pore distribution of the sample after the experiment,the closed-cell porosity increased from 3.43%to 8.10%.Combined with phase and typical morphology analysis,it further indicates that the baseline calibration method has high accuracy and practicality.Based on the experimental results,the judgment criteria and definition of high-temperature compressive strength were proposed,providing theoretical support for the research of refractory materials and the design of high-temperature furnace linings.

关 键 词：耐火材料 粘土砖 压缩变形 基线校准法 高温耐压强度 

分 类 号：TQ175[化学工程—硅酸盐工业]